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How bad and dangerous are the local Beavers? Beavers known for being very clever in creating a flood area for their hunting ground. They mulch small trees and pile them up to stop water flow to creating a pond or just plainly blocks small stream and making a big lake-like water reservoir. But never ever seen a 100 plus year tree this big chewed up by those creatures. !
In the Tierra del fuego regions, Beavers were imported from Canada for its furs. But now they have populated uncontrolled and causing devastating ill effect mauling down hundred year old trees.http://img-s-msn-com.akamaized.net/tena ... =529&y=445

I have seen them take down much larger stuff than that in Northern Minnesota. They will take them down, but rarely can move them unless they drop them directly in to a river. Sometimes where they drop, is where they need them, and will build around them.

I remember the big, long beaver dams being part of portage trails we used between the major lakes. I remember walking along some several hundred yards at least of the trail was the top of a dam (never stopped to measure them, because I did not think they were anything special). There was some massive old trees sticking out of the dam. I kind of got the impression that they cut them, dropped them in the water of stream, and then the trees would wedge in to the banks. They would then fill them in. Perhaps seasonal flooding might help get things they have dropped up stream, even far up the banks, loose and moved in to place during higher water.